# A soluble compound of a poisonous element M, when heated with Zn/H2SO4 gives a colourless and extremely  poisonous gaseous compound N, which on passing through a heated tube give a silvery mirror of element M. identify M and N.

Navjyot Kalra
8 years ago
The poisonous element M may be As. So on the basis of the given facts,
AsCI3 + 6H $\overset{Zn/H_{2}SO_{4}}{\rightarrow}$AsH3 + 3HCI
(N)
2AsH3 $\overset{\Delta}{\rightarrow}$2 As + 3H2
(M)
Hence M = As; N = As H3